<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
  let a;
  console.log(typeof a);

  const str = 'abc';
  console.log(typeof str);

  const n = 100;
  console.log(typeof n);

  const b = true;
  console.log(typeof b);

  const s = Symbol('s');
  console.log(typeof s);

  console.log(typeof function(){});

  console.log(typeof null);
  console.log(typeof ['a', 'b']);
  console.log(typeof {x: 100});
</script>
</body>
</html>
